He played in Major League Baseball (MLB) for the San Diego Padres, Boston Red Sox and Atlanta Braves.

In 2002, pitched at the Triple-A level, and was a late-season call-up to the Padres, appearing in three MLB games while allowing four runs in 1+1⁄3 innings (27.00 ERA).

In 2003, he pitched for Boston at the Triple-A level, and made 17 MLB appearances (2–0 record with 4.63 ERA in 23+1⁄3 innings).

[2] Shiell spent the 2007 season with the Kansas City Royals organization, at the Double-A and Triple-A levels.

His final professional season was 2008, when he pitched in the Milwaukee Brewers organization, again at the Double-A and Triple-A levels.